<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>TODO前端简易版</title>
    <script src="js20_example_todo.js"></script>
    <style>
        li{
            margin-bottom: 1rem;
        }
        li > button{
            background-color: green;
        }
    </style>
</head>
<body>
    <h1>TODO前端简易版</h1>
    <div>
        <label for="item">代办事项</label><input type="text">
        <button >新增</button>
    </div>
</body>
</html>